Some years ago the late Mike Jackson did an artical on building silencers that was published in the journal. Whilst the basis of the artical was about the construction of the silencer I do recall it had a table in it that gave details of the volume of each chamber in relation to engine capacity. If anyone can recall which journal it was in or has a copy of the artical I would be pleased to have the information.

John,have just returned from my hols and seen your post.I have the design on a simple software programe.I will email you a copy over the weekend.I know you will say thanks,I have sent out about a dozen copies and only two people have responded.It does not encourage people to help .

Barry, Would you kindly let me have a copy of your silencer/muffler information.our local club has started to enforce tighter noise controls so have to construct suitable exhaust for a range of engines. I would like to thank you in advance for your trouble, my address is. capt.wot@googlemail.com regards. Brian.

Thank you very much Barry, apreciated the very quick responce to my request .May be able to return the complement one day. Should now be able to make some progress, so thanks again Barry. Best regards.Brian